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实现任意个数参数的函数指针.html
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实现任意个数参数的函数指针.html
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实现任意个数参数的函数指针
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<h3 id="实现任意个数参数的函数指针"><a href="#实现任意个数参数的函数指针" class="headerlink" title="实现任意个数参数的函数指针"></a>实现任意个数参数的函数指针</h3><p>V8中回调函数的函数指针原型为Handle<value> Callback(const Arguments& args);</value></p>
<p>将参数抽象成类，将返回值抽象为模板句柄，从而实现回调函数和参数类型、参数个数、返回值不相关，这也是一种解耦合。</p>
<p>Argument只需提供参数读写成员函数即可，这与C语言中的…的va_start、va_arg函数组有异曲同工之妙。</p>
<p>而一般函数指针都指定返回值和参数类型，这种无法通用。</p>
<p>另外的方式（C++11以上支持）：变长模板参数。</p>
<p>获取变长模板参数：递归获取。方式：建立无模板参数的函数，其他函数递归获取。</p>
<p>例：<br><figure class="highlight cpp"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">template</span><></span><br><span class="line"><span class="class"><span class="keyword">struct</span> <span class="title">count</span><>{</span></span><br><span class="line"> <span class="keyword">static</span> <span class="keyword">const</span> <span class="keyword">int</span> value = <span class="number">0</span>;</span><br><span class="line">}</span><br><span class="line"><span class="keyword">template</span><<span class="keyword">typename</span> T, <span class="keyword">typename</span> ...Args></span><br><span class="line"><span class="class"><span class="keyword">struct</span> <span class="title">count</span><T, Args...>{</span></span><br><span class="line"> <span class="keyword">static</span> <span class="keyword">const</span> <span class="keyword">int</span> value = <span class="number">1</span> + count<Args...>::value;</span><br><span class="line">}</span><br></pre></td></tr></table></figure></p>
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<p><span>本文标题:</span><a href="/实现任意个数参数的函数指针.html">实现任意个数参数的函数指针</a></p>
<p><span>文章作者:</span><a href="/" title="回到主页">Hesai Wang</a></p>
<p><span>发布时间:</span>2018-06-14, 20:02:39</p>
<p><span>最后更新:</span>2018-06-14, 20:24:20</p>
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<span>原始链接:</span><a class="post-url" href="/实现任意个数参数的函数指针.html" title="实现任意个数参数的函数指针">http://cocoyimasa.github.io/实现任意个数参数的函数指针.html</a>
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